Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e58cac0b5fa4eb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 19:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe6565f77b1153ca40bb4f7e38de378d SHA-1: 3107d1bcb776cd941d3afa8030a4998b25df6703 SHA-256: a5e58cac0b5fa4ebf73ecaeab86f9f1ea2c7349c1067e3bb9d304501c14599c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest it may be used to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tidymoney.com/ckfinder/userfiles/files/63546906190.pdf In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/siguv.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/17369783215.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/13428200686146559c927f7.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/10392461066.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/95813782889.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/19507268225.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/zitonenafukubiji.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/niwawonelupoturego.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fofulapovexowuwuguwigi.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/makavusagadipenano.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48663a4df---70568730417.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/lojumeg.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d51319bb6d53798adbe79b1052b0bceb/92443170632.pdfIn PDF document text
    • http://davcpundri.com/css/file/50357345801.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/xutezunamamesenuzajuritib.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/55094591256.pdfIn PDF document text
    • http://djpress.pl/Image/files/55153341499.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xurikikurefanepodopivox.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/demowepan.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98220882023.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/28896324578.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/40cd031982c5874632e0249c0519b957/49499556605.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/30864116607.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0294550ec913283c518a2f1a58c21a22/mubugugonemewuvob.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zugaxuraduwufaxebezusixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=online+games+to+play+on+your+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10940 bytes
SHA-256: b3d2cc4b0bdaf47e7aa09a23867b9a915405b7b70c0bfd194325d81ee1ab6c3e
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 17884 bytes
SHA-256: 15706858e3c856add2ac2c9214bf7bc6b830379cc85d832f0ce29975a0851eaa
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1